Tim Marshall

By Tim Marshall

IN the 1970s, I was a geography student at Flinders University, learning about cycles of global warming and cooling. In the last 650,000 years, there have been seven cycles of advance and retreat of glaciers, and the last ice age ended only around 7,000 years ago.

Most people will be surprised to know that these climate variations are attributed to very small variations in Earth’s orbit that change the amount of incoming solar energy, and the temperature changes are also quite small.

Read full story in Acres Australia’s digital issue #101.